Answer:
He received $320 last year
Step-by-step explanation:
The mean absolute deviation is given by the next formula:

Where n is the number of points in the data set and x with a bar on top is the mean.
In our case,

and n=25.
Then,

Finally,

The answer is 1.4 once rounded.
9514 1404 393
Explanation:
The applicable rules of exponents are ...
(a^b)(a^c) = a^(b+c)
1/a^b = a^-b
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I think you use
xamount(1-.8)
.8 being 80% as a decimal.
1 being 100%
so .2 or 20% remaining multiplied by whatever amount.